脱脂棉在离子液体中的溶解性能研究

Study on the Dissolution of Absorbent Cotton in Ionic Liquid

有效地合成了离子液体1-烯丙基-3-甲基咪唑氯代盐([Amim]Cl),并探讨了脱脂棉纤维素在该离子液体中的溶解性能。测定了原、再生纤维素的聚合度,结果表明溶解前后纤维素的聚合度发生了很大变化,随着溶解温度的提高、时间的延长,再生纤维素聚合度降低;采用红外光谱、X-射线衍射及热重分析等手段对脱脂棉纤维素在离子液体[Amim]Cl中溶解和再生前后的结构变化进行了分析。结果表明,脱脂棉纤维素可直接溶解于离子液体[Amim]Cl而不发生其它衍生化反应。再生纤维素较原纤维素结晶状态由纤维素I转变为纤维素Ⅱ,再生后纤维素热分解温度降低,热稳定性略有下降。

Ionic liquid, 1-allyl-3-methylimidazolium （[ Amim] Cl）, has been successfully synthesized, and then applied as solvent for absorbent cotton cellulose with high degree of polymerization（DP）. The DP of both original and regenerated cellulose have been measured, and the results show a big change between them. As the dissolving temperature rises and dissolving time extends, the DP of cellulose drops in a certain degree. The physicchemical properties of the regenerated cellulose films have been characterized by X-ray diffractometer （XRD） , infrared spectrometric analyzer （FTIR）, thermogravimetric analysis （TGA） and differential scanning calorimeter （DSC）. The results show that 1-ally-3-methylimidazolium chloride is a good non-derivatizing solvent to absorbent cotton. The crystalline form of absorbent cotton transforms completely from cellulose Ⅰ to cellulose Ⅱ after regeneration from [ Amim] Cl solution and the regenerated cellulose exhibits a lower temperature of thermal decomposition and slightly decreased thermal stability.